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Case Tractors Discussion Forum
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Case 2090 - Oil Pressure Loss in Powershift 1 and

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Tony Barnett

03-04-2005 12:53:53




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Can anyone help me with this problem?

I have a 1983 Case 2090 with a hedge cutter on the back. When in powershift gear 1 and reverse, keep losing oil pressure to the back end and the remote valves. When in powershift 2 and 3, pressure is fine. This occurs at any revs. When losing pressure, dipping the clutch makes pressure rise.

Has clean trans oil and filters. Otherwise runs well.

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Tony Barnett

03-29-2005 12:56:31




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 Re: Case 2090 - Oil Pressure Loss in Powershift 1 in reply to Tony Barnett, 03-04-2005 12:53:53  
On studying a schematic view of the hydraulic system for a 2090, the hitch valve and the remote valves take an additional back up supply from the pump compensator. I am wondering if the pump compensator has a problem causing me to lose flow? I would be very grateful if anyone out there has any ideas/experience of this.



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case trader

03-04-2005 16:26:10




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 Re: Case 2090 - Oil Pressure Loss in Powershift 1 in reply to Tony Barnett, 03-04-2005 12:53:53  
i guess i would check the pressure on the valve body first 1st gear uses c1 &c2 reverse uses c2&c4 all the test ports except lube should be near the same you also might check the remotes get a guage i use a 5000 psi use adapter and a hyd.coupler plug in to remote pull remote lever watch guage only does one direction at a time move guage to all remotes should all be close in pressure.



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mEl

03-06-2005 05:30:17




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 Re: Case 2090 - Oil Pressure Loss in Powershift 1 in reply to case trader, 03-04-2005 16:26:10  
Since your problem is related to the two ranges which use the clutch to start motion in either direction, (C2)! something is causing a leak to occur when applying C2 to start the tractor in motion, since the RPS is given priority over all other systems it shows up as slow remotes when the leaky clutch is in use. To a Case technician this is a tool we use to pinpoint RPS problems. I would suspect the bolts that hold C2-C3 clutch carrier have loosened or broken allowing the carriers to separate and leak the oil supply off to C2 or less likely, a piston seal problem on C2 piston. I have had one tractor that had a split feeder tube but that is unlikely, just something to keep in the back of your mind. Good luck. mEl

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FNA

03-08-2005 18:47:45




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 Re: Case 2090 - Oil Pressure Loss in Powershift 1 in reply to mEl, 03-06-2005 05:30:17  
Why isn"t 3rd range affected?(broken seal ring, think about it) Tractor will need to be split regardless but, I"ve never seen broken bolts affect Rev.



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Tony Barnett

03-28-2005 12:41:44




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 Re: Case 2090 - Oil Pressure Loss in Powershift 1 in reply to FNA, 03-08-2005 18:47:45  
Oil pressure in test ports on power shift control valve all hold their pressure (including the lube port). Can it still be leaking inside if pressure is holding?



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FNA

03-05-2005 20:01:31




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 Re: Case 2090 - Oil Pressure Loss in Powershift 1 in reply to case trader, 03-04-2005 16:26:10  
Sounds like a broken seal rings at back of c3 hub. Tractor will need to be split.



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